Back when I was trucking I got ticketed more than once for the "no jake brakes" signs!
Salt Lake was the first one. I did as usual I contacted a lawyer and told him what I had gotten the ticket for and why I wanted to fight it.
It wasn't to keep it off my record, or to save $ but more of the principal of the fact that I was ticketed for using a safety device.
He took my information and said he'd call me back. Later that day he asked me if there was anyway I could come through Salt Lake and meet up with him anytime soon.
I told him I most likely could on my way back depending on what kind of load I got and where it was going to.
Well the next day I unloaded in Seattle and reloaded back to FL and called him and told him I'm meet him on my way down.
We decided to meet @ the Sap Bros Truck on California Ave off I-15.
I spent the night there and in the morning he arrived @ the time we agreed upon and went inside to "meet" over breakfast. First off he was amazed that they had a "smokers club" dining room for CDL drivers only.
Then we talked over b-fast and discussed the exact details of the citation, trucks in general, fake brakes & how they worked, and other exhaust brake systems.
After b-fast he asked me to ride out to the site where I was ticketed with him.
We talked more as we drove and every once in a while I'd hear a truck using the jake brake and would tell him that is what he was hearing.
When we got to where the sign is he hummed something and laughed while taking notes. All the while trucks going by and turning on the jakes as they went by.
As we started down the hill he pointed out that on the other side of the wall was the most exclusive country club in the Salt Lake area.
He said he'd check farther into it for me and took me back to my truck which he immediately fell in love with the 10" straight stacks, the 8" Stainless drop sun-visor (dropped 8" down over the stock one), and all the other stainless, chrome & chicken lights my truck had.
When he called me back he said he was going to fight my ticket for me on a $500 retainer, but he was going to find other drivers to join in on the fight and if he did I would get all my $ back and we'd file a class action suit against the city. (he despised the country club & most of it's members)
He fought the tickets and won. Well actually the judge threw them out the minute he presented proof that jake brakes are indeed a safety device that assists and saves the service brakes. The class action suit was denied because all of our tickets had been dismissed.
But I got several other tickets in different states and he took care of all of them for me @ no charge and told me I'd put him on to a $ market of fighting them and he made $75-100 off from every one he fought and all he had to do was call the local prosecutor where ever the ticket was and as soon as he explained to them who he was, why he was calling and that he was willing to find enough drivers to make it a class action suit they dropped the ticket.
SO yes they will ticket drivers for using them. But they are mostly aimed at guys like me that
had straight stacks and deliberately used to rattle all the windows in town and set off alarms in cars and buildings all along the main street.